Water Pump Impeller for Yamaha Outboard Motor 6G1-44352-00-00 / Mercury Mariner Outboard Motors 47-11590M Sierra 18-3066 Aftermarket Brand: SouthMarine Number of Blades: 6, Plastic Hub, Net Weight: 9g Height: 17.85mm External Impeller Overall Diameter: 39.56mm External Impeller Overall Diameter: 39.56mm